Comprehensive and Detailed Explanation From Exact Extract of ISTQB Certified Tester Advanced Level – Test Manager v3.0 syllabus:
Defect clustering (e.g., Pareto-style concentration of defects in certain components) is used to informrisk-based testingso that testing can beprioritized and focused on the riskiest areasof the product. In the CTAL-TM v3 syllabus, the test manager uses defect data and trends toprioritize test effort, allocate test depth/techniques where risk is higher, and provide traceable justification in planning and control (Chapter 4: Risk-Based Testing and effort allocation; Chapter 3: Test Planning – using historical/defect data to shape the approach and focus).
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